A theft-proof lock

Abstract

The case relates to a theftproof lock, comprising a lock cylinder, a first key and a second key, the lock cylinder comprising a lock shell and a lock barrel installed in the lock shell, a key hole being axially and penetratingly arranged on the lock barrel, the lock shell comprising a lock shell connecting part and an installation cavity for installing the lock barrel, a main ball locking assembly being arranged between the lock shell connecting part and the lock barrel, a first locking assembly being further arranged on the side wall of the lock barrel, the first locking assembly being capable of cooperating with the main ball locking assembly to lock the lock barrel relative to the lock shell after the lock barrel is rotated; the first key and the second key are both provided with a first tooth flower corresponding to the main ball locking assembly, the first key is further provided with a tooth flower groove for avoiding the first locking assembly, and the second key is further provided with a convex strip for lifting the first locking assembly. The first locking assembly is added, then two keys with different structures are provided, the combination of the double locking assemblies and the differentiated keys is realized, and the functions of the spare key and the main key are obviously distinguished.

Description

Technical Field

[0001] This utility model relates to the field of locks, specifically to an anti-theft lock. Background Technology

[0002] Mechanical lock cylinders remain the mainstream choice for residential and commercial settings due to their reliability and stability. Traditional mechanical lock cylinders are typically equipped with a single-function key, or use different key patterns to distinguish between the master key and the renovation key.

[0003] Currently, there is an AB key lock on the market. This lock has two types of keys: a renovation key and a master key. When the master key is inserted and rotated, the renovation key cannot be used. Its structure is generally completed by the cooperation of a small steel ball and a pin. The difference between the two keys is small, only the processing method of the keys is different. Some keys have a forked head to avoid the AB steel ball and pin position, while others have the front end directly milled flat and the teeth moved back as a whole.

[0004] For example, the invention patent with authorization announcement number CN105386650B discloses an AB key lock that no longer relies on tiny steel balls, but directly achieves AB conversion by controlling the side posts with different keys; after the homeowner completes the renovation, the renovation key does not need to be retrieved or can be thrown away directly, so there is no need to worry about others entering the homeowner's house by patching and reusing the key; the key shape no longer has any gaps, making it beautiful and practical, and more importantly, no one other than the homeowner can visually distinguish between AB keys.

[0005] While the aforementioned existing technologies provide some technical solutions for using master keys and renovation keys, these solutions all involve permanently altering the internal structure of the lock cylinder using a spare key after renovation is completed, in order to achieve the effect of locking / unlocking only with the master key. Once the spare key is used up, it becomes invalid and cannot be used again.

[0006] However, in actual use, another situation often arises. For example, after a homeowner hires a nanny or housekeeper to clean their home, the homeowner may need to leave temporarily. In this case, the homeowner needs a spare key that can lock the door but cannot be opened at will. This spare key is given to the nanny or housekeeper so that they can lock the door after the homeowner leaves. This also prevents the spare key from being used illegally to unlock the door, ensuring home security. At the same time, the spare key can be reused by the nanny or housekeeper.

[0007] Therefore, how to overcome the above-mentioned defects and provide an anti-theft lock that allows the backup key to lock only and the main key to operate in both directions has become an important issue that needs to be addressed by those skilled in the art. Utility Model Content

[0008] This utility model overcomes the shortcomings of the above-mentioned technology and provides an anti-theft lock.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: An anti-theft lock includes a lock cylinder, a first key, and a second key. The lock cylinder includes a lock shell and a lock cylinder installed inside the lock shell. A keyhole is axially extended through the lock cylinder. The lock shell includes a lock shell connecting part and a mounting cavity for installing the lock cylinder. A main pin locking assembly is provided between the lock shell connecting part and the lock cylinder. A first locking assembly is also provided on the side wall of the lock cylinder. After the lock cylinder is rotated, the first locking assembly can cooperate with the main pin locking assembly to lock the lock cylinder relative to the lock shell. Both the first key and the second key have first teeth that correspond to and cooperate with the main pin locking assembly. The first key also has a toothed groove for avoiding the first locking assembly. The second key also has a protrusion for lifting the first locking assembly.

[0010] Furthermore, the first locking component includes a first mounting hole formed on the side wall of the lock cylinder and a pin installed in the first mounting hole. The first mounting hole includes a first through hole communicating with the keyhole and a second through hole communicating with the first through hole. The diameter of the first through hole is smaller than the diameter of the second through hole. The pin includes a pin shaft extending into the first through hole and a pin head that is limited and installed in the second through hole.

[0011] Furthermore, the top of the pin head is provided with an inclined surface that matches the wall surface of the lock cylinder, and the upper end of the side wall of the second through hole is provided with an inwardly concave arc surface that matches the inclined surface to limit the lock cylinder to rotate only in one direction.

[0012] Furthermore, the main pin locking assembly includes a first spring, a flat pin abutting the upper end of the first spring, and a main pin abutting the upper end of the flat pin. The lock housing connecting part is provided with a second mounting hole communicating with the mounting cavity, and the lock cylinder is provided with a third mounting hole communicating with the keyhole. The first spring and the flat pin are installed in the second mounting hole, and the main pin is installed in the third mounting hole. The second mounting hole and the third mounting hole are coaxially connected.

[0013] Furthermore, a first irregular bead locking assembly is provided on one side of the lock cylinder, and a horizontal bar locking assembly is provided on the upper side of the lock cylinder to cooperate with the first irregular bead locking assembly to lock the lock cylinder. Both the first key and the second key are provided with serpentine grooves that cooperate with the first irregular bead locking assembly. The serpentine grooves are provided on the back of the first key and the second key.

[0014] Furthermore, the first irregular bead locking assembly includes a side bead hole opened on the side wall of the lock cylinder, a second spring installed at the bottom of the side bead hole, and a side bead installed in the side bead hole with one end abutting against the second spring. The side bead has a first groove opened on its upper side facing upward and a top foot extending downward at its lower end to cooperate with the serpentine groove.

[0015] Furthermore, the horizontal bar locking assembly includes a horizontal bar groove on the side wall of the lock cylinder that communicates with the side bead hole, a horizontal bar inserted in the horizontal bar groove that can move radially within the horizontal bar groove, a fourth mounting hole recessed at the bottom of both ends of the horizontal bar groove, a third spring installed in the fourth mounting hole, and the horizontal bar includes protrusions at both ends, the lower ends of the protrusions at both ends respectively abutting against the third springs at both ends.

[0016] Furthermore, the inner wall of the mounting cavity is recessed with a first long groove for limiting the horizontal bar and thus restricting the rotation of the lock cylinder. The first long groove has an arc-shaped cross-section, and the upper end of the horizontal bar is provided with an arc-shaped strip that matches the shape of the first long groove.

[0017] Furthermore, a second groove is provided on the upper side of the side bead, the second groove being located to the left of the first groove and its depth being lower than the depth of the first groove.

[0018] Furthermore, an anti-drilling plate is inserted into the lock cylinder, and an anti-drilling pin is inserted into the lock shell.

[0019] Compared with the prior art, the beneficial effects of this utility model are: This solution adds a first locking component to the main pin tumbler locking assembly. By using a first key and a second key with different structures, it achieves a combination of dual locking components and differentiated keys, clearly distinguishing the functions of the backup key and the main key. After the first key drives the lock cylinder to rotate, the first locking component cooperates with the main pin tumbler locking assembly to lock the lock cylinder relative to the lock housing, achieving secondary locking of the lock cylinder and solving the core problem of unreliable backup key functionality in traditional lock cylinders. The cooperation between the main pin tumbler assembly and the first locking component forms a dual protection of basic and secondary locking. The structure is simple and balances security, convenience, and cost-effectiveness. It provides convenience and practicality for the use of mechanical lock cylinders, and is particularly suitable for scenarios such as rental housing and domestic services where key access control is clearly required. Attached Figure Description

[0020] Figure 1 These are exploded views of the lock cylinder and structural diagrams of the first key in this case.

[0021] Figure 2 This is one of the structural diagrams of the first key in this case.

[0022] Figure 3This is a structural diagram of the second key in this case.

[0023] Figure 4 This is a schematic diagram of the structure after the second key is inserted into the lock cylinder in this case.

[0024] Figure 5 yes Figure 4 A cross-sectional view along the AA direction.

[0025] Figure 6 This is a structural diagram of the lock cylinder and the first locking component in this case.

[0026] Figure 7 This is a schematic diagram of the lock shell in this case.

[0027] Figure 8 This is a structural diagram of the main pin locking assembly in this case. Figure 9 A schematic diagram of the detached state of the lock cylinder, the first irregular bead locking assembly, and the horizontal bar locking assembly.

[0028] Figure 10 This is the second structural diagram of the first key in this case. Detailed Implementation

[0029] The following examples provide a more detailed description of the features and other related characteristics of this utility model, to facilitate understanding by those skilled in the art: like Figures 1 to 10 As shown, this invention provides an anti-theft lock, including a lock cylinder 100, a first key 200, and a second key 300. The lock cylinder 100 includes a lock shell 1 and a lock cylinder 2 installed inside the lock shell 1, with a keyhole 21 axially extending through the lock cylinder 2. The lock shell 1 includes a lock shell connecting part 11 and a mounting cavity 12 for installing the lock cylinder 2. A main pin locking assembly 3 is provided between the lock shell connecting part 11 and the lock cylinder 2. A first locking assembly 7 is also provided on the side wall of the lock cylinder 2. After the lock cylinder 2 is rotated, the first locking assembly 7 can cooperate with the main pin locking assembly 3 to lock the lock cylinder 2 relative to the lock shell 1. Both the first key 200 and the second key 300 have first teeth 231 that correspond to and cooperate with the main pin locking assembly 3. The first key 200 also has a tooth groove 201 for avoiding the first locking assembly 7, and the second key 300 also has a protrusion 301 for lifting the first locking assembly 7.

[0030] As described above, this invention uses the main pin locking assembly 3 as the basic locking unit to achieve axial locking between the lock cylinder 2 and the lock shell 1. The main pin locking assembly 3 cooperates with the first tooth 231 of the key to achieve the initial unlocking / locking operation of the lock cylinder 100. By adding a first locking assembly 7 as a secondary locking unit, when it rotates with the lock cylinder 2 to the position corresponding to the main pin locking assembly 3, it cooperates with the main pin locking assembly 3 to form a circumferential lock, locking the lock cylinder 2 and the lock shell 1 again, making it impossible to reverse the operation after the first key 200 is locked, effectively improving security and convenience. The tooth groove 201 of the first key 200 and the key protrusion 301 of the second key 300 effectively distinguish the functions of the keys.

[0031] Under normal conditions, the front ends of the main pin locking assembly and the first locking assembly 7 are both inserted into the keyhole 21 of the lock cylinder 2, and the main pin locking assembly 3 and the first locking assembly 7 are in a locked state, thereby achieving locking.

[0032] When the first key 200 is inserted into the keyhole 21, the first toothed groove 231 pushes up the main pin locking component 3, unlocking the lock cylinder 2 and the lock shell 1. At this time, the lock cylinder 2 can rotate. When the lock cylinder 2 rotates, it drives the first locking component 7 to rotate to the corresponding position of the main pin locking component 3. The main pin locking component 3 and the first locking component 7 cooperate to lock the lock cylinder 2 and the lock shell 1, achieving secondary locking. Since the first key 200 also has a toothed groove 201 to avoid the first locking component 7, the front end of the first locking component 7 falls into the toothed groove 201. The first key 200 cannot push the first locking component 7 out of the keyhole 21, and cannot release the cooperation between the main pin locking component 3 and the first locking component 7. That is to say, the first key 200 can only be used to lock the lock cylinder 100, but cannot be used to unlock it. In daily life, it is often used by homeowners to provide spare keys to nannies, housekeepers, etc., so that these people can lock the door after leaving.

[0033] To facilitate quick secondary locking and save on the structural design of the lock cylinder 100, in the process of the main pin locking assembly 3 cooperating with the first locking assembly 7 to lock the lock cylinder 2 and the lock shell 1 to achieve secondary locking, preferably, the rotation angle of the lock cylinder 2 is set to ninety degrees.

[0034] When the second key 300 is inserted into the keyhole 21, the first tooth 231 lifts the main pin locking component 3 accordingly, and at the same time, the protrusion 301 lifts the first locking component 7, thereby releasing the cooperation between the main pin locking component 3 and the first locking component 7, so that the lock cylinder 2 and the lock shell 1 are unlocked. At this time, the lock cylinder 2 can be rotated at will and can be used to lock / unlock. That is to say, the second key 300 is a regular master key, which is usually carried by the homeowner in daily life.

[0035] Specifically, such as Figures 1-6 As shown, the first locking component 7 includes a first mounting hole 71 formed on the side wall of the lock cylinder 2 and a pin 72 installed in the first mounting hole 71. Through the design of the pin 72 and the first mounting hole 71, the locking function of the first locking component 7 is achieved using a simple structure, making production and installation simple and operation convenient. The first mounting hole 71 includes a first through hole 711 communicating with the keyhole 21 and a second through hole 712 communicating with the first through hole 711. The diameter of the first through hole 711 is smaller than the diameter of the second through hole 712. The pin 72 includes a pin shaft 721 extending into the first through hole 711 and a pin head 722 that is limited and installed in the second through hole 712.

[0036] As described above, the diameter of the first through hole 711 is smaller than the diameter of the second through hole 712. The pin shaft 721 extends into the first through hole 711, and the pin head 722 is positioned and installed in the second through hole 712. That is to say, in specific implementation, the cross-sectional area of ​​the pin shaft 721 is smaller than the cross-sectional area of ​​the pin head 722, and a limiting step is formed between the pin head 722 and the pin shaft 721 to limit the pin head 722's installation in the second through hole 712. Through the stepped hole design of the first mounting hole 71, combined with the step formed by the pin head 722 and the pin shaft 721, the installation structure of the pin 72 is greatly simplified, eliminating the need for additional retaining rings or limiting components and reducing assembly complexity.

[0037] When the first locking component 7 is in the locked state, the main pin locking component 3 pushes into the second through hole 722, thereby holding the pin head 722 in place and pushing the front end of the pin shaft 721 into the keyhole 21. At this time, the lock cylinder 2 is locked relative to the lock shell 1. Since the first key 200 has a toothed groove 201 to avoid the pin shaft 721, the lock cylinder 2 cannot rotate. When the second key 300 is inserted into the keyhole 21, the protrusion 301 pushes the pin shaft 721 out of the first through hole 711, thereby pushing the pin shaft 721 upward and driving the pin head 722 upward until the main pin locking component 3 is pushed out of the second through hole 712, thereby unlocking the lock cylinder 2 and the lock shell 1. At this time, the lock cylinder 2 can rotate freely and can be used for locking / unlocking.

[0038] To consider the cost-effectiveness of combining anti-theft performance with cost-effectiveness, in this case, it is preferable to set the number of the first mounting hole 71 and the pin 72 to one set. This facilitates manufacturing, simplifies the structure, saves costs, and still produces a good anti-theft effect. Of course, users can also choose to match and set two or more sets of the first mounting hole 71 and pin 72 to improve anti-theft performance and increase the difficulty of technical opening, and are not limited to this.

[0039] Continue to refer to Figures 1-6As shown, further, a bevel 7221 that matches the wall of the lock cylinder 2 is provided at the top of the pin head 722, and an inwardly concave arc surface 7121 that matches the bevel 7221 to limit the lock cylinder 2 to rotate only in one direction is provided at the upper end of the side wall of the second through hole 712.

[0040] In specific implementation, the lock cylinder 2 adopts a common structure in the art, namely a common cylindrical structure. Through the limiting cooperation of the inclined surface 7221 and the concave arc surface 7121, when the second key 300 is inserted into the lock cylinder 100, the lock cylinder 2 can only rotate in one direction until it reaches the lower end of the corresponding main pin locking assembly 3, thereby locking the first locking assembly 7. Preferably, in this case, the lock cylinder 2 can rotate clockwise to lock the first locking assembly 7 and the main pin locking assembly 3, which is more convenient and prevents reversible unlocking that might occur if the lock cylinder 2 is rotated in the opposite direction after locking. Of course, when the second key 200 is inserted into the lock cylinder 100 to lock the lock cylinder 2 a second time, the preset rotation direction can also be counterclockwise; the user only needs to modify the setting direction of the inclined surface 7221 and the concave arc surface 712 accordingly. like Figures 1-8 As shown, specifically, the main pin locking assembly 3 of this case includes a first spring 31, a flat ball 32 abutting against the upper end of the first spring 31, and a main pin 33 abutting against the upper end of the flat ball 32. In specific implementation, the first spring 31 is a helical compression spring, ensuring that the flat ball 32 is always subjected to an upward thrust, providing continuous elastic force, driving the flat ball 32 to move upward, and indirectly pushing the main pin 33 into the locked position. Through the linkage of the first spring 31, the flat ball 32, and the main pin 33, the locking state is reliably guaranteed under stable elastic force output, avoiding accidental unlocking due to vibration or external force. The lock housing connecting part 11 has a second mounting hole 111 communicating with the mounting cavity 12, and the lock cylinder 2 has a third mounting hole 22 communicating with the keyhole 21. The first spring 31 and the flat ball 32 are installed in the second mounting hole 111, and the main pin 33 is limited and installed in the third mounting hole 22. The second mounting hole 111 and the third mounting hole 22 are used to provide a movement trajectory for the main pin locking assembly 3 to ensure stable operation. The second mounting hole 111 and the third mounting hole 22 are coaxially connected. This coaxial connection design can effectively ensure the installation accuracy of the main ball locking assembly 3 and avoid jamming caused by hole position deviation.

[0041] In specific implementation, the main pin locking assembly 3 preferably has five sets. Of course, considering production costs and anti-theft performance, the number can be more or less. To achieve better anti-theft performance in conjunction with the main pin locking assembly 3, in specific implementation, the diameter and depth of the hole of each first tooth 231 are different. Because the differentiated design of each first tooth 231 breaks the regular coding of the equidistant and equal-depth teeth of the traditional lock cylinder, it forms an irregular random coding, which is difficult for relevant personnel to crack by trial and error, increasing the difficulty of technical opening. This also makes key duplication more difficult, because key duplication requires obtaining the diameter and depth parameters of all tooth holes at the same time, cutting off the illegal duplication path at the source. On the other hand, the different depths of the first teeth 231 require different force and stroke when the key 200 is inserted. When a mismatched key is inserted, due to the diameter or depth deviation, it cannot accurately match all the main pins 33, causing the lock cylinder 2 and the lock shell 1 to still be stuck, forming obvious jamming feedback, reminding the user of abnormal operation; at the same time, it also makes non-technical opening more difficult.

[0042] like Figures 1-10 As shown, to further enhance the anti-theft performance of the lock in this case, a first irregular bead locking component 4 is provided on one side of the lock cylinder 2, and a horizontal bar locking component 5 is provided on the upper side of the lock cylinder 2 to cooperate with the first irregular bead locking component 4 to lock the lock cylinder 2. Both the first key 200 and the second key 300 have serpentine grooves 232 that correspond to and cooperate with the first irregular bead locking component 4. The serpentine grooves 232 are located on the back of the first key 200 and the second key 300. The serpentine grooves 232 are used to drive the first irregular bead locking component 4 to move, thereby releasing the locking state between the first irregular bead locking component 4 and the horizontal bar locking component 5, ultimately unlocking the lock cylinder 2. That is to say, the back structures of the first key 200 and the second key 300 are the same, with the serpentine grooves 232 located on the back of the toothed grooves 201 of the first key 200 and the back of the protrusions 301 of the second key 300. In this case, the two keys differ only in structure in the toothed groove 201 and the raised strip 301. For ease of understanding and description, the same technical features of the two other keys mentioned in this case are described using the same reference numerals in conjunction with the accompanying drawings, such as the first toothed groove 231 and the serpentine groove 232.

[0043] like Figure 1 , Figures 4-10As shown, specifically, the first irregular bead locking assembly 4 includes a side bead hole 41 opened on the left side wall of the lock cylinder 2, a second spring 42 installed at the bottom of the side bead hole 41, and a side bead 43 installed in the side bead hole 41 with one end abutting against the second spring 42. The side bead 43 has a first groove 431 opening upwards on its upper side and a top foot 432 extending downwards at its lower end, corresponding to and cooperating with the serpentine groove 232. In specific implementation, the top foot 432 is used to cooperate with and slide within the serpentine groove 232 of the key. In specific implementation, to ensure the security of the lock, the user can set three to six sets of the first irregular bead locking assembly 4. In this case, to facilitate production and save production costs while ensuring good anti-theft performance, it is preferable to have five sets of the first irregular bead locking assembly 4. Of course, considering production costs and anti-theft performance, the number can be more or less. The unique side bead 43 structure in this case differs from the common side bead structures on the market, increasing anti-theft performance, raising the difficulty of technical opening, and increasing the difficulty of key duplication.

[0044] Specifically, such as Figure 1 , Figures 4-10 As shown, the horizontal bar locking assembly 5 includes a horizontal bar groove 51 formed on the upper side wall of the lock cylinder 2 and communicating with the side bead hole 41, and a horizontal bar 52 inserted into the horizontal bar groove 51 and capable of radial movement within the horizontal bar groove 51. Fourth mounting holes 53 are recessed at the bottom of both ends of the horizontal bar groove 51, and third springs 54 are installed in the fourth mounting holes 53. The horizontal bar 52 includes protrusions 521 at both ends, the lower ends of which abut against the third springs 54 at both ends. The protrusions 521 facilitate the abutment between the horizontal bar 52 and the third springs 54.

[0045] As described above, based on the description of the structure of the first irregular bead locking assembly 4 and the horizontal bar locking assembly 5, when no key is inserted into the lock cylinder 2 or an incorrect key is inserted, the side bead 43 cannot be driven to move correctly. The horizontal bar 52 is in a raised state under the force of the third spring and cannot descend to cooperate with the first groove 431 of the side bead, so that the lock cylinder 2 is in a stationary locked state, thereby achieving locking. When the correct key with the serpentine groove 232 is inserted, the top foot 432 moves along the direction of the serpentine groove 232 in the serpentine groove 232. The side bead 43 moves in the side bead hole 41 along the serpentine groove 232 on the key. When the key is finally inserted to the bottom, several first grooves 431 will be in a straight line, forming a receiving groove for accommodating the horizontal bar 52. Then the lock cylinder 2 is rotated, and the horizontal bar 52 contacts and squeezes the inner wall of the lock shell 1, causing the horizontal bar 52 to fall into the receiving groove, thereby causing the lock cylinder 2 to rotate relative to the lock shell 1 and achieve unlocking. When the key 200 is removed, the second spring 42 drives the side bead 43 to reset, causing several first grooves 431 to return to a state where they are not on a straight line. At the same time, the third spring 52 drives the horizontal bar 52 to reset, and the two complete the locking reset.

[0046] Through the dynamic cooperation of the first irregular bead locking component 4 and the horizontal bar locking component 5, and the spring reset mechanism, a logically rigorous three-dimensional locking and reliable reset system is constructed. This linkage mechanism of dynamic alignment, precise cooperation, and automatic reset not only improves the unlocking complexity through the dual verification of the trajectory of the side bead 43 and the position of the horizontal bar 52, but also ensures the stability of the locked state by the rigid reset of the spring system. From a structural logic perspective, it cuts off the cracking path of traditional locks that rely on a single movement trajectory or static locking, and significantly enhances the uniqueness of the lock in the unlocking process and the reliability of the locked state.

[0047] Furthermore, continue to refer to Figures 1-6 As shown, a first elongated groove 121 is recessed on the inner wall of the mounting cavity 12 to limit the rotation of the lock cylinder 2 by restricting the horizontal bar 52. The first elongated groove 121 has an arc-shaped cross-section, and the upper end of the horizontal bar 52 is provided with an arc-shaped strip 522 that matches the shape of the first elongated groove 121. In specific implementation, the arc-shaped groove 121 facilitates the easy rotation of the lock cylinder 2 when the correct key 200 is used, allowing the horizontal bar 52 to be squeezed out of the groove 121.

[0048] When the lock cylinder 2 is illegally pried open, the arc-shaped bar 522 of the horizontal bar 52 and the arc surface of the long groove 121 form a rigid contact, and the force is evenly distributed to the entire groove wall to prevent structural damage caused by single-point force. The depth of the long groove 121 matches the height of the horizontal bar 52. When violently rotated, the two form a circumferential limiting cooperation, and the horizontal bar 52 cannot completely disengage from the long groove 121. The lock cylinder 2 is in the state, which can effectively prevent the lock cylinder 100 from being illegally opened.

[0049] When no key is inserted into the lock cylinder 2 or an incorrect key is inserted, the side bead 43 cannot move correctly. The horizontal bar 52 is in a raised state under the force of the third spring 52 and cannot descend to engage with the first groove 431 of the side bead 43. Nor can the several first grooves 431 be aligned to form a receiving groove for the horizontal bar 52. Therefore, when the lock cylinder 2 is rotated until the horizontal bar 52 is engaged in the long groove 121 on the inner wall of the lock case 1 by the elastic force of the third spring 54, the lock cylinder 2 cannot rotate, preventing unauthorized opening. When the correct key is inserted, the horizontal bar 52 can be pushed out of the long groove 121, and then its lower end engages in the receiving groove formed by the several first grooves 431. This does not restrict the rotation of the lock cylinder 2, allowing normal unlocking.

[0050] Reference Figure 1 , Figure 4 , Figure 5 , Figure 9 As shown, in this embodiment, a second groove 423 is also provided on the upper side of the side bead 43. The second groove 423 serves to prevent prying and picking during illegal opening, and can interfere with criminals using tools to pry open the side bead 43. The second groove 423 is located to the left of the first groove 431 and its depth is lower than that of the first groove 431. In the conventional design of the prior art, one end of the lock cylinder 100 is provided with the lock cylinder 2, and the other end is provided with components such as an internal knob or a tail gauge. In specific implementation, preferably, in this embodiment, a lever 6 is connected to one side of the lock cylinder 2, and two lock shells 1 and lock cylinders 2 are symmetrically arranged on the left and right with the lever 6 as the axis. That is, in this embodiment, the lock shell 1 is designed to be detachable on both sides, and the lock cylinder in this case is a double-lock cylinder with double lock cylinders 2. Lock cylinders 2 are provided at both ends, and the door can be opened with a key from both sides, which is convenient to use and has a wide range of applications. Of course, in another embodiment, the lock shell 1 can also be in a non-detachable state, and the lock cylinders 2 can still be symmetrically connected to both sides of the lever 6. Of course, when the embodiment is a double lock cylinder 2, it also includes all the components and necessary structures that match the lock cylinder 2 as described above, and will not be repeated here.

[0051] Reference Figure 1 As shown, in this embodiment, an anti-drilling plate 8 is inserted into the lock cylinder 2. The anti-drilling plate 8 directly protects the lock cylinder 2, preventing criminals from using drill bits or other tools to illegally penetrate the lock cylinder 2 through the keyhole 21 and cause damage. An anti-drilling pin 9 is inserted into the lock shell 1, protecting the lock shell 1 and preventing criminals from using drill bits or other tools to illegally penetrate the lock cylinder 2 through the lock shell 1 and cause damage. By setting the anti-drilling plate 8 and the anti-drilling pin 9, the overall anti-drilling performance of the lock cylinder 100 is improved, further enhancing security.

[0052] As stated above, this case protects a type of anti-theft lock, and all technical solutions that are the same as or similar to those in this case should be considered to fall within the scope of protection of this case.

Claims

1. An anti-theft lock, comprising a lock cylinder (100), a first key (200), and a second key (300), wherein the lock cylinder (100) comprises a lock shell (1) and a lock cylinder (2) installed within the lock shell (1), wherein the lock cylinder (2) has a keyhole (21) extending axially through it, and the lock shell (1) comprises a lock shell connecting part (11) and a mounting cavity (12) for installing the lock cylinder (2), characterized in that: A main pin locking assembly (3) is provided between the lock shell connecting part (11) and the lock cylinder (2). A first locking assembly (7) is also provided on the side wall of the lock cylinder (2). After the lock cylinder (2) is rotated, the first locking assembly (7) can cooperate with the main pin locking assembly (3) to lock the lock cylinder (2) relative to the lock shell (1). The first key (200) and the second key (300) are both provided with a first tooth (231) that corresponds to and cooperates with the main pin locking assembly (3). The first key (200) is also provided with a tooth groove (201) for avoiding the first locking assembly (7). The second key (300) is also provided with a protrusion (301) for lifting the first locking assembly (7).

2. The anti-theft lock according to claim 1, characterized in that: The first locking assembly (7) includes a first mounting hole (71) opened on the side wall of the lock cylinder (2) and a pin (72) installed in the first mounting hole (71). The first mounting hole (71) includes a first through hole (711) communicating with the keyhole (21) and a second through hole (712) communicating with the first through hole (711). The diameter of the first through hole (711) is smaller than the diameter of the second through hole (712). The pin (72) includes a pin shaft (721) extending into the first through hole (711) and a pin head (722) that is limited and installed in the second through hole (712).

3. The anti-theft lock according to claim 2, characterized in that: The top of the pin head (722) is provided with a bevel (7221) that matches the wall of the lock cylinder (2), and the upper end of the side wall of the second through hole (712) is provided with a concave arc surface (7121) that matches the bevel (7221) to limit the lock cylinder (2) to rotate only in one direction.

4. The anti-theft lock according to claim 1, characterized in that: The main pin locking assembly (3) includes a first spring (31), a flat pin (32) abutting the upper end of the first spring (31), and a main pin (33) abutting the upper end of the flat pin (32). The lock housing connecting part (11) is provided with a second mounting hole (111) communicating with the mounting cavity (12). The lock cylinder (2) is provided with a third mounting hole (22) communicating with the keyhole (21). The first spring (31) and the flat pin (32) are installed in the second mounting hole (111), and the main pin (33) is installed in the third mounting hole (22). The second mounting hole (111) and the third mounting hole (22) are coaxially connected.

5. An anti-theft lock according to any one of claims 1-4, characterized in that: The lock cylinder (2) is also provided with a first irregular bead locking component (4) on one side. The lock cylinder (2) is provided with a horizontal grid locking component (5) on the upper side, which cooperates with the first irregular bead locking component (4) to lock the lock cylinder (2). The first key (200) and the second key (300) are both provided with a serpentine groove (232) that corresponds to and cooperates with the first irregular bead locking component (4). The serpentine groove (232) is opened on the back of the first key (200) and the second key (300).

6. The anti-theft lock according to claim 5, characterized in that: The first irregular bead locking assembly (4) includes a side bead hole (41) opened on the side wall of the lock cylinder (2), a second spring (42) installed at the bottom of the side bead hole (41), and a side bead (43) installed in the side bead hole (41) and one end abutting against the second spring (42). The side bead (43) has a first groove (431) opened on the upper side facing upward, and a top foot (432) extending downward at the lower end to cooperate with the serpentine groove (232).

7. The anti-theft lock according to claim 6, characterized in that: The horizontal bar locking assembly (5) includes a horizontal bar groove (51) connected to the side bead hole (41) on the side wall of the lock cylinder (2), and a horizontal bar (52) inserted in the horizontal bar groove (51) that can move radially within the horizontal bar groove (51). The bottom of both ends of the horizontal bar groove (51) is recessed and provided with a fourth mounting hole (53). A third spring (54) is installed in the fourth mounting hole (53). The horizontal bar (52) includes a protrusion (521) at both ends. The lower ends of the protrusion (521) at both ends respectively abut against the third spring (54) at both ends.

8. The anti-theft lock according to claim 7, characterized in that: The inner wall of the mounting cavity (12) is recessed with a first long groove (121) for limiting the horizontal grid (52) and thus restricting the rotation of the lock cylinder (2). The first long groove (121) has an arc-shaped cross section, and the upper end of the horizontal grid (52) is provided with an arc-shaped strip (522) that matches the shape of the first long groove (121).

9. The anti-theft lock according to claim 8, characterized in that: The upper side of the side bead (43) is also provided with a second groove (433), which is located to the left of the first groove (431) and its depth is lower than that of the first groove (431).

10. The anti-theft lock according to claim 1, characterized in that: The lock cylinder (2) is provided with an anti-drilling plate (8), and the lock shell (1) is provided with an anti-drilling pin (9).

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